Together or Not At All

Callie never liked Luke. She thought he was pretentious and too full of himself. The only problem was that they had to work together.
Callie and Luke were both superheroes, and when a mysterious person threatens to end the world, they have to put their differences aside in order to save everyone.
What will happen when they end up spending time together? Will they become friends - or more? Or, will they realise how horrible each other was, and cause the whole world to suffer because of it?